The Traveline website does in theory use the same data as the TFL journey planner and both should plan journeys across the Greater London / everywhere else divide.

There are no night buses out to the Kent Thameside region, very few London night buses run beyond the GLA boundary. The nearest night bus routes are N21 to Bexleyheath or N89 to Erith / Slade Green which might be cheaper than Lewisham if it comes down to a minicab.

I agree with Crispy's solution (arrives Lewisham 0105, this is an Orpington train so continues via Hither Green & Grove Park. This seems to be the last train out of London in the south east trains direction.)

If he misses that, TFL journey planner suggests Hammersmith & City Line to Moorgate then a 21 bus that leaves Moorgate 0046, due Lewisham 0119 (this is the last 21 of the day - the night service N 21 doesn't start from Moorgate - it starts at Trafalgar Square, then to Bank, then picks up the 21 route.)

Bus 45 to Blackfriars then N89 to Erith or Slade Green is an alternative it offers.

If friend can get down the underground by 0020 (and the distance from the domestic platforms at St Pancras to the northern line is longer than you'd think) then there's a connection on to the last DLR of the day to Woolwich Arsenal, due Woolwich 0101.

Having a total fucking nightmare with the whole situation atm as my sis was just gonna pick him up from Kings cross or to make it an easier (driving) journey Lewisham (I'm in ) so just a scamp up the A2.

Now it's all fucked & gonna have to see if I can find some other magical way of saving Snaps 4 fucking hours sat at St Pancreas.

Do massively appreciate the help.

Hate that the public transport world pretty much ends at 12.30 yet we should all be using it.

Not that late, they don't. Last Kent-wards Nat Ex to Dover etc is 2330 from Victoria, first set down is Gillingham (some earlier in the day do stop at Bluewater)

Kings Ferry (they do a coach service that touches Gravesend, although mainly aimed at London commuters) last departure is 2200 from central London and that's only on Fridays.

I presume that friend has already booked a ticket?

One little thought, if friend is travelling from the east midlands to the Dratford / Gravesend sort of patch, there is a direct coach from some midlands towns (e.g. Leicester) run by Thandi Express - it's not that well known outside the Asian communities...